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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd236658007a30f2327688422d66a78ed92fc124bb6dbb97dbaecab1a4e61c1db' 
  AND token = '+qYsuozg+W/M2KBZlUnTut6uTn++2lDTQ+SjBlAgg7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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