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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bac59eb297a0e099f3a5620b843bcd7dda39a60342c102289cae5c36e59d083' 
  AND token = 'dKjQx4h/GYqu1Bgder2BfkHgYv8G2oEaeX79wIoAtbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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