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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792648331623de3e30dd86560da762bd54bf7b59ac18135c34503077b4ee81c9' 
  AND token = 'w9HUClHCZ/2umRk+rnW1ADkF+7lo2RbWULk3l5stPSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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