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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d052792b7abb6792fb6f23f20110ed385b1eb899848edc914c94153fc924bd' 
  AND token = 'nUTHy8n0Eb8rj5R7Q4z7ijdLN3SghHvpzqaf4KPM6Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00201

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}