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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9480da582fba478a92a11a9e9e032af2b42b3e51ec6ac1d2460c5d8ebcc3b069' 
  AND token = '0GfgqNQ6ltEn1EBqRmuz3YQql3VAtckeZsfc/K7rJhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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