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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3cba8bef24c7e09c9c5927b2177180e72f872606d16d7ba7fd1a642909bd3a7' 
  AND token = 'Ydi6Yi5yZ17yWiun9X8atSpf6CK+CEWoKc1miqdrJG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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