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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71451ef47c8fc9369fece207ecfcf12c0e82edd6c87862e3a6528af2b547951' 
  AND token = 'vzQ6aU/NY03+quDKfuZCxJFrA6omx0IpPXQ/0JnEe6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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