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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89aefb37de7e77a38a8cf2cd8de051ccd1b1a00d66cc8f058ee1a067060a2ca' 
  AND token = '7A/iHVK40p5jD7OQvrUmP8/ZGcxRK43fwcEKE5hjG9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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