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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e08b14bd6c47a9b9b0bb0faaeb85257f26832d0b228f7777473113d8b8e2c37' 
  AND token = '7LiA389HJEZB5oiysX3Qfoggd2dKwX4cpbhDvYOjwEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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