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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbbb877b3d24c9fc47f85f8920c1616aab1696a5fed1ad0798ff327e2f2b13a' 
  AND token = '+c+byrheyimelRqbyhND5BdLrn+kyaPRxEiS7sisvvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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