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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cba7ecc8ce991224c59d7a449add2e4813e66f8f07511e25f2e5216888ac70' 
  AND token = 's7FiMZw5tlyi1NeHkiK2Y89SyZ8hg6A82toSkYw92ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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