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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da103aa9480726a06adde41b188bea2a8310a866df31d616dd8a4139d1992a5' 
  AND token = '5pJEQwklf9Kzi09qP6Zvoy/o9ORVLUY+ik9nB5GbBqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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