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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4644a6d4752dbd341176549fa0108bb417304350483fd7cd757b24e4bf9fc7' 
  AND token = 'D/aVxWKUjzegp79a2brVdWm5cHhClEkm1/kdfgYTw0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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