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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07be82dc4cc3e8a0a93093d52d8ba976dad2d9913bb0e7aa89892a7361cbc7f' 
  AND token = 'wLn+ov/sz2xO4IeUdUl8xbD5b7+6eAoPBuA2G1vuNL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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