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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bc8d70dcd9ea9f4f3a5cf491864490dbc9664bbd48d127b28cf79814e0f4bd' 
  AND token = 'bA1uzgHPsMcpIs+LBQ+AI2ypcIbui3LYK+cuAy/pOgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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