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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10973667c76eaa84c6596dd48b3f0efce481b7bf3fd35503b01123975fa84d8' 
  AND token = 'NH4dZiqztjR/yGevWg40BgQTF5z7jy9kiV9u0t64NtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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