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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3fba216b105ecefd9609bd8e12b8b1ac5289d131da129dde55db2408929752f' 
  AND token = 'CHrDnbD4IghpdPZ0RXNZCKWUFj+D5bdHKavRHPF1HSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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