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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28706087d29039d3c06aba954c34724f452e2aaa61b756dc9b78eee0c1ea74d7' 
  AND token = 'FnnZVEABsU8XhclPNk+c5OAYV/T5zVnwxCCMvyCrb3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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