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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3507f5da881bcda0828b143198a050bf6832c8e4957e4d67ce35fb9ad40cdeb5' 
  AND token = '/UtFILsYxmwdm/T3GIseAe/meG1GsfwT7dQmyT+DMKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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