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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c24ae88d5dca1d87d182fa2d2e356b871d6d80e08d7aed95618c8ae10d540a' 
  AND token = 'o8zkOnEeY+akkSEvOvqtL6vUORdDwds+NXpWyeMgHNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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