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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f887aba87c79af49da935c94c4456ffa8f61383ae32d47f5b50b464222b5c0' 
  AND token = 'NPzIn/0Kwpwkyl0PXeNMiOKllcTta643DDlW7dE0kZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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