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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92743bc803bd37d0fcd29a6c97fed7ebe99600710f733820feb5d51308cc40a2' 
  AND token = 'eJvGv9xU4v8Nv9ikVmj+sOqG3gnBwGVe+E93mXSdSNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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