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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdb0443b7ec627f1f6f2905b198fe0f6a1e66d78b98f4662ccba1dfd9c76e5f' 
  AND token = 'HeUv+ER5vpVbCewCvT5BfN/tZ4LwesUU6RWO8qSGHdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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