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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4f3c6c1817cbbf400c421aa5f49c3d689ab044398048f66a1fa5dd6989a9aa' 
  AND token = 'kcXkRC1wkDyWdzFWT1R81sR4YemHJGrAMSVv3RtwTH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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