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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82ed3f813ef888f48e529d1378d24b114a37e390b3921c79ccf9762cb747929' 
  AND token = 'deOWJ9uEDkBRYxP+oWEKuN6Uzd6sdZo15y+kHHyVyps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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