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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889be39708dc45f76d37446a4bd40eaf76ce5292733031742ab9e1639fa97028' 
  AND token = 'DBa83DtTBiqeFgJK8RAP5k99GE8VabGlYwcx4Ylb5kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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