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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039c2f0746772510b0ee4685c95b164c80803e89e542725ec0715da4a79561d7' 
  AND token = 't2ubEUzOZEe/5ZVzD5sWjSSfzsbfTzrQzA0yfT2m1Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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