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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f8170bc693ee661bcab89b0a47e0f6f62a8bb2388071767e6c68575653df0f' 
  AND token = 'd/niDHjrlpjjc43n590P/HAgM6oKFVYt8v/NVKLZxaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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