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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907944bd56c6df8850119b0f7070b7afa8e2bcd57eccd8749911c6601982a513' 
  AND token = '/fmIwbza5hjbQwCWo/7tWND0BE2oWSVYAM447PEXX3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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