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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be51701462255d08f5d1d0d9c5e8add9af963c65f52c5bfefa1b89b47f42627a' 
  AND token = 'vbskdjaGscAw/Fdh8xIUM0RkE5XFPtwLWhgOvHcfe40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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