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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2e939bb6ed1fa0b42f92fe472da503c16705de8538af68ac6f3cd8eae174d6' 
  AND token = '67yTP74amANpu+XuKvQ2dxh0sMDGw1kMqOvvyc0rrnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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