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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1993a47e8b51f119db9d0cf718b027d911aa4840615e1ac5bb5ce275001a5a2c' 
  AND token = 'MXuRLUilpHxnceTr8CnE8yrKbeaz9AcoIh6o7fvqWF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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