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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c95b24bc2146b157aa3df399c36d7e50b7b8eb5993e96909a8e81cfb10e96b0' 
  AND token = 'lz9EAsOJZ+2rzhh3NIknX2mfU4oEpdN/pxmAdV7NOQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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