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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc2849866d11005641e67a8a09a9034340bd087808b4196aca1e16a9f56e907' 
  AND token = 'hzTzxobbRTxeg64y46Phng76Qvp698yElwyCM7DKecQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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