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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7ebd18a40c87799c8f2b84920484e6952a9fe211099fcafe44b818e79cf865' 
  AND token = 'YxUd1dSs+ULO8JcQhNGIRV/nMCDNh0aLlA+o2xOifRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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