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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76069cae02dc06997625cf62311533dfb6f2e852d83f958ea0ea8d3ead36f994' 
  AND token = 'Hk4XsVXu3h04oVXE8YxEFIwZzkGtTErGVIUlraiaFSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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