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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047e7518e511e62caa071a355b482591120958e2476e6a070d9f1d2389a25dbd' 
  AND token = 'GgWFZtU/FIGSCP4Y2ZxL5s6puX9b5N35l/mAqDZmppY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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