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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b1f9d17dd1759d0d673b4a08ac9bfc52302793b7fa92974836472e17853bac' 
  AND token = 'tONmkLcWJFiPGkuF4z815M/ZxT0BT4gm4YY3EgddKxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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