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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5eee0c8fdbab54cb9fd6f61eb9ff097eaa5caade21d0844d8ecee2ca97b2969' 
  AND token = 'el0M9MIFS1kN0Ux8JFy2LGfmsuJZGVtmBEgt5BmhXog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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