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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8eed70c0836dde0074c29dbb09cb907d02ad58c9270dcc4aa8eac418e0b13c4' 
  AND token = 'XUws7xukLmmpwBi1kno+W3pAcvRI6EDLhMsakqHISz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00161

JSON explain

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