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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f4baa23ff858834a396353738999124dfbad65770a620ecbe275874ba1902f' 
  AND token = 'fVc4fk0D3BQ18kbxnDWDfXbbdgVIdNdsdIqlKYG8U6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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