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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f898633449dd8965de710eea8d140604ed258a31a7d0aa4a2869671a50432810' 
  AND token = 'HZgxxJIrFbWDW/nxT5WpCxNVIaofuw2u1nQnd75DDDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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