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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31569142f37dbc0dc0716d65ce4c21cb6a1f1a609768e528a3905e3669095e54' 
  AND token = '1WBSGOMEUb/3vh2KFh+oyF0d/hWfohwwhgNKNRYd11Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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