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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0997f5afc7b47888c74324d765d5641818b6bea95d609a571fc67028fe80dca5' 
  AND token = 'A5HEDeMYI2R5BvoZYwy5RvcTz1Hwg37uriqNVvDUKMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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