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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9e86bbfef85af0db0369877a942b25df7a067ec6d85a1bde883a74074f6be9' 
  AND token = 'WKFytCEgDIUMfC33reKOJ6V7htm3fkqnAzoiQ1L2veY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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