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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada16fd18fc8e9266df1efc5c49f82d1bd8796f7931bc66e74fd0eb1e6fdfc1b' 
  AND token = '8L95EyOib1+LtbihTdwlN4MDcpLgDOzfyWgRimpx2Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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