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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc87bac4fff775ea0665add15c7a1b608db81af6cbf60dc8363a6e1a9d09b026' 
  AND token = 'yg/rszuC0UdInt9CzvcQS3hKMsYLhIvGn+q1iTDGT7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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