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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd567c8826b0de98468f4f99d7f9ae977586eb24418f5a3beae26943aef2c134f' 
  AND token = '1TZIzxLdBDQHxL4SujMYEE6IWgg8O6CStuayrJExiLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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