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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eee092ef162cbd9a3f678fc326e5b5431922c4db65f0bd4066fe595ff689af9' 
  AND token = 'E84Fvh03d8NtQnD8rcOihM7VVfeALliYdr3iJhArdUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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