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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c9ab39c4b02a383346673e596260c093999a4c552c85a59c65fc3a4143327e' 
  AND token = '+lWm6KVVXemb5fl8yTstjS0fd+wwB4XM9dGuMnh+YNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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