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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1556da7b11f5a7f569a36185e861c8c6fb563152ab618ee26a7e09d1fab63565' 
  AND token = 'Arkf2cEgKU7pLTgXdxdrQhrpXWdTeOw4g6X/NIsXZUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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