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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4804d866ea12a78a63d0f90aa50b990abe967ac96c49986580d0ad382763e5' 
  AND token = 'w7o0Z/8TL4vL6717swgle7cxvuVfnkMVAjz3LTASiUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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