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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0061540a2eccedef0d733ae52c1db1ecb1e7ba37d1698003260567d9f3496ae6' 
  AND token = 'O/IDzVz5hDm6yTo8RGRVwsD6Pk/9whrShG4OV8Thppw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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