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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99bd753e8888c5f35a8e8aac9d6972328a036c51b4a989daa0d43e340f4ab19' 
  AND token = 'EYogN2RgeywhjDf9QiFDqlQakft3EkkEnAWojOQ/S/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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