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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dc0a40464b7c99a07ad9af93d22ef2fe0207bcff0a1ec57257164783f53ce2' 
  AND token = 'q0eq9gYrkS7GOdxbzLDwv07e0cUJoaLLTBs1yJkWgmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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