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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff5077b4f9c7cfa68ed7999cad83c4cc6a00bf4fb009a18ce7b0ed6ff45fa40' 
  AND token = 'SIKaJEtx/m8+nB9UGNSFCDmCu1QvpB95oi0MJAiidIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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