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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d6a91a67511a9ff72a09f5e7cf9dbd285cbb970444eda09821d7d1aef1a020' 
  AND token = 'c0J4BMmve+SXPlnr13izGF8HjtNGuMgvVxGs5IQRfKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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