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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbf1e569e88450ab5e629c736a1a6e4ea7f47a6ca15fdad2ec9fbed430ee591' 
  AND token = 'MW7mYDq5TgXad4d6YSYko9xQ1k7GvlLrdrLYXg6Spwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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