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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0446a09f2fef32b1bc6c4a84b16d8b37d9e4ac982ae9cd4b4ed692f7a373e30' 
  AND token = 'CT0OLl+tIzw0avVGErb1b/6KJ7xpJKNdmoMvD/81iXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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