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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05a026106711c1d95231615676672c83f7131cef8ed56f67cefff14940123c2' 
  AND token = 'Nf7XfIUMrVN3b9BRaHF5VxJ5aEbFx2l/DjUIr031cyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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