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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba4411b42fd80bbc5c12b8ea4734db791adabe21ff668193abe1186f4ad37c5' 
  AND token = '2ZuxJ0xgDQRYHybzJ5QHoBVc3S2jpg1Vc3cudO8Bg9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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