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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9d65821a8434610e0e7a4068d67c434b5dee1263ca7807a38ef86b65c44779' 
  AND token = 'kOMJra4PncEjJARm8S1sq4HEeozaa0aSoYwVG/Y7Nm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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