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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31312e2efa9fdfefecdb49f92b1d59114420c27a8d4dd98601173be00ebf99e' 
  AND token = 'V42C4i+65+dHP23Z1fmvL5qgO4UZIF9eyPQdd/CPbfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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