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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f6c510a706a746286d5ac13ababe68dc5b66a5a8f402b6e8e9e7c5c6aa680f' 
  AND token = 'j9Z7+zCX2v7oQSPftzHvJfA3v7++Ckt+cs6mJozhc7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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