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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132266c036724c7c8505e415a137f5d80b4a297a211eff087347c31c59b1a07d' 
  AND token = 'yVxoWZOQvRAolFxoBofUFaDKC91kaNz7gEySTIgN1JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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