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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5cb4bf799ef5bf6a24fd5963c0d8c42af25a9cbda194bfaaa12498e07bd207f' 
  AND token = 'tVj/gg7M7DUuDS2She+adDGOOf/BmTTITNA7vz7EA9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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