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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe54b35cec04b1090119ea22eaaf3fb72b8232a734eb4ff843c545edaad4424' 
  AND token = 'FGqdrvKCHAs5cmu9AankvGMx/NfLJOLuaAtf/FXcMCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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