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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379d8654f360643d82bb43e23045559f6bf6a28fa4ec1f899d24e76334f36e30' 
  AND token = '5intC3u8/1ioHbREK2WhmEQC0s8E2UVY58GfFaDq8p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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